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Abstract
Chapter from: M
65: Salt Tectonics: A Global Perspective
Edited By
M.P.A. Jackson, D.G. Roberts, and S. SnelsonAuthor:
Mark G. Rowan Structure, Tectonics, Paleostructure
Published 1995 as
part of Memoir 65
Copyright © 1995 The American Association of Petroleum
Geologists. All Rights Reserved. |
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Rowan,
M. G., 1995, Structural styles and evolution of allochthonous salt, central
Louisiana outer shelf and upper slope, in M. P. A. Jackson, D. G.
Roberts, and S. Snelson, eds., Salt tectonics: a global perspective: AAPG
Memoir 65, p. 199-228. |
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Chapter
9
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Structural
Styles and Evolution of Allochthonous Salt, Central Louisiana
Outer Shelf and Upper
Slope |
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Mark
G. Rowan
Department of Geological
Sciences and Energy & Minerals Applied Research Center
University of Colorado
Boulder, Colorado, U.S.A.
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Abstract
Seismic interpretation
and section restoration are combined with recent models of salt deformation
to describe the geometry and evolution of allochthonous salt from the central
Louisiana outer shelf and upper slope. Scattered salt bodies are connected
by a complex system of diachronous salt welds or remnant salt having two
end-member geometries: (1) regionally extensive, subhorizontal sheets bounded
by north-dipping (counter-regional) feeders and characterized by common
listric growth faults that may accommodate significant extension; and (2)
elliptical depressions bounded by dipping salt welds and arcuate growth
faults that accommodate little extension.
Most salt bodies in the study
area were emplaced at or near the sea floor and grew by downbuilding (passive
diapirism). Reactive and active diapirs are rare. The former are confined
to the updip margins of shallow salt sheets, and the latter may occur basinward
of major salt-withdrawal minibasins. Many salt bodies along the downdip
margins of sheets have been modified by contraction.
Two end-member evolutionary
models account for the range of observed structural styles. In "counter-regional"
systems, which are more typical of the shelf, salt rises through south-leaning
feeder stocks and flows both downdip and along strike to form allochthonous
sheets. In "salt stock canopy" systems, which are more typical of the upper
slope, bulb-shaped salt stocks expand outward and form salt canopies. Subsequent
gravitational collapse and sedimentary loading form bowl-shaped minibasins,
from which salt is displaced into allochthonous tongues and remnant salt
bodies.
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